Commit | Line | Data |
---|---|---|
4f86d3a8 LB |
1 | /* |
2 | * sysfs.c - sysfs support | |
3 | * | |
4 | * (C) 2006-2007 Shaohua Li <shaohua.li@intel.com> | |
5 | * | |
6 | * This code is licenced under the GPL. | |
7 | */ | |
8 | ||
9 | #include <linux/kernel.h> | |
10 | #include <linux/cpuidle.h> | |
11 | #include <linux/sysfs.h> | |
5a0e3ad6 | 12 | #include <linux/slab.h> |
4f86d3a8 | 13 | #include <linux/cpu.h> |
3a53396b | 14 | #include <linux/capability.h> |
8f3e9953 | 15 | #include <linux/device.h> |
4f86d3a8 LB |
16 | |
17 | #include "cpuidle.h" | |
18 | ||
19 | static unsigned int sysfs_switch; | |
20 | static int __init cpuidle_sysfs_setup(char *unused) | |
21 | { | |
22 | sysfs_switch = 1; | |
23 | return 1; | |
24 | } | |
25 | __setup("cpuidle_sysfs_switch", cpuidle_sysfs_setup); | |
26 | ||
8a25a2fd KS |
27 | static ssize_t show_available_governors(struct device *dev, |
28 | struct device_attribute *attr, | |
66198f36 | 29 | char *buf) |
4f86d3a8 LB |
30 | { |
31 | ssize_t i = 0; | |
32 | struct cpuidle_governor *tmp; | |
33 | ||
34 | mutex_lock(&cpuidle_lock); | |
35 | list_for_each_entry(tmp, &cpuidle_governors, governor_list) { | |
36 | if (i >= (ssize_t) ((PAGE_SIZE/sizeof(char)) - CPUIDLE_NAME_LEN - 2)) | |
37 | goto out; | |
38 | i += scnprintf(&buf[i], CPUIDLE_NAME_LEN, "%s ", tmp->name); | |
39 | } | |
40 | ||
41 | out: | |
42 | i+= sprintf(&buf[i], "\n"); | |
43 | mutex_unlock(&cpuidle_lock); | |
44 | return i; | |
45 | } | |
46 | ||
8a25a2fd KS |
47 | static ssize_t show_current_driver(struct device *dev, |
48 | struct device_attribute *attr, | |
66198f36 | 49 | char *buf) |
4f86d3a8 LB |
50 | { |
51 | ssize_t ret; | |
752138df | 52 | struct cpuidle_driver *cpuidle_driver = cpuidle_get_driver(); |
4f86d3a8 LB |
53 | |
54 | spin_lock(&cpuidle_driver_lock); | |
752138df LB |
55 | if (cpuidle_driver) |
56 | ret = sprintf(buf, "%s\n", cpuidle_driver->name); | |
4f86d3a8 LB |
57 | else |
58 | ret = sprintf(buf, "none\n"); | |
59 | spin_unlock(&cpuidle_driver_lock); | |
60 | ||
61 | return ret; | |
62 | } | |
63 | ||
8a25a2fd KS |
64 | static ssize_t show_current_governor(struct device *dev, |
65 | struct device_attribute *attr, | |
66198f36 | 66 | char *buf) |
4f86d3a8 LB |
67 | { |
68 | ssize_t ret; | |
69 | ||
70 | mutex_lock(&cpuidle_lock); | |
71 | if (cpuidle_curr_governor) | |
72 | ret = sprintf(buf, "%s\n", cpuidle_curr_governor->name); | |
73 | else | |
74 | ret = sprintf(buf, "none\n"); | |
75 | mutex_unlock(&cpuidle_lock); | |
76 | ||
77 | return ret; | |
78 | } | |
79 | ||
8a25a2fd KS |
80 | static ssize_t store_current_governor(struct device *dev, |
81 | struct device_attribute *attr, | |
66198f36 | 82 | const char *buf, size_t count) |
4f86d3a8 LB |
83 | { |
84 | char gov_name[CPUIDLE_NAME_LEN]; | |
85 | int ret = -EINVAL; | |
86 | size_t len = count; | |
87 | struct cpuidle_governor *gov; | |
88 | ||
89 | if (!len || len >= sizeof(gov_name)) | |
90 | return -EINVAL; | |
91 | ||
92 | memcpy(gov_name, buf, len); | |
93 | gov_name[len] = '\0'; | |
94 | if (gov_name[len - 1] == '\n') | |
95 | gov_name[--len] = '\0'; | |
96 | ||
97 | mutex_lock(&cpuidle_lock); | |
98 | ||
99 | list_for_each_entry(gov, &cpuidle_governors, governor_list) { | |
100 | if (strlen(gov->name) == len && !strcmp(gov->name, gov_name)) { | |
101 | ret = cpuidle_switch_governor(gov); | |
102 | break; | |
103 | } | |
104 | } | |
105 | ||
106 | mutex_unlock(&cpuidle_lock); | |
107 | ||
108 | if (ret) | |
109 | return ret; | |
110 | else | |
111 | return count; | |
112 | } | |
113 | ||
8a25a2fd KS |
114 | static DEVICE_ATTR(current_driver, 0444, show_current_driver, NULL); |
115 | static DEVICE_ATTR(current_governor_ro, 0444, show_current_governor, NULL); | |
4f86d3a8 | 116 | |
8a25a2fd KS |
117 | static struct attribute *cpuidle_default_attrs[] = { |
118 | &dev_attr_current_driver.attr, | |
119 | &dev_attr_current_governor_ro.attr, | |
4f86d3a8 LB |
120 | NULL |
121 | }; | |
122 | ||
8a25a2fd KS |
123 | static DEVICE_ATTR(available_governors, 0444, show_available_governors, NULL); |
124 | static DEVICE_ATTR(current_governor, 0644, show_current_governor, | |
125 | store_current_governor); | |
4f86d3a8 | 126 | |
8a25a2fd KS |
127 | static struct attribute *cpuidle_switch_attrs[] = { |
128 | &dev_attr_available_governors.attr, | |
129 | &dev_attr_current_driver.attr, | |
130 | &dev_attr_current_governor.attr, | |
4f86d3a8 LB |
131 | NULL |
132 | }; | |
133 | ||
8a25a2fd KS |
134 | static struct attribute_group cpuidle_attr_group = { |
135 | .attrs = cpuidle_default_attrs, | |
4f86d3a8 LB |
136 | .name = "cpuidle", |
137 | }; | |
138 | ||
139 | /** | |
8a25a2fd | 140 | * cpuidle_add_interface - add CPU global sysfs attributes |
4f86d3a8 | 141 | */ |
8a25a2fd | 142 | int cpuidle_add_interface(struct device *dev) |
4f86d3a8 LB |
143 | { |
144 | if (sysfs_switch) | |
8a25a2fd | 145 | cpuidle_attr_group.attrs = cpuidle_switch_attrs; |
4f86d3a8 | 146 | |
8a25a2fd | 147 | return sysfs_create_group(&dev->kobj, &cpuidle_attr_group); |
4f86d3a8 LB |
148 | } |
149 | ||
150 | /** | |
8a25a2fd | 151 | * cpuidle_remove_interface - remove CPU global sysfs attributes |
4f86d3a8 | 152 | */ |
8a25a2fd | 153 | void cpuidle_remove_interface(struct device *dev) |
4f86d3a8 | 154 | { |
8a25a2fd | 155 | sysfs_remove_group(&dev->kobj, &cpuidle_attr_group); |
4f86d3a8 LB |
156 | } |
157 | ||
158 | struct cpuidle_attr { | |
159 | struct attribute attr; | |
160 | ssize_t (*show)(struct cpuidle_device *, char *); | |
161 | ssize_t (*store)(struct cpuidle_device *, const char *, size_t count); | |
162 | }; | |
163 | ||
164 | #define define_one_ro(_name, show) \ | |
165 | static struct cpuidle_attr attr_##_name = __ATTR(_name, 0444, show, NULL) | |
166 | #define define_one_rw(_name, show, store) \ | |
167 | static struct cpuidle_attr attr_##_name = __ATTR(_name, 0644, show, store) | |
168 | ||
169 | #define kobj_to_cpuidledev(k) container_of(k, struct cpuidle_device, kobj) | |
170 | #define attr_to_cpuidleattr(a) container_of(a, struct cpuidle_attr, attr) | |
171 | static ssize_t cpuidle_show(struct kobject * kobj, struct attribute * attr ,char * buf) | |
172 | { | |
173 | int ret = -EIO; | |
174 | struct cpuidle_device *dev = kobj_to_cpuidledev(kobj); | |
175 | struct cpuidle_attr * cattr = attr_to_cpuidleattr(attr); | |
176 | ||
177 | if (cattr->show) { | |
178 | mutex_lock(&cpuidle_lock); | |
179 | ret = cattr->show(dev, buf); | |
180 | mutex_unlock(&cpuidle_lock); | |
181 | } | |
182 | return ret; | |
183 | } | |
184 | ||
185 | static ssize_t cpuidle_store(struct kobject * kobj, struct attribute * attr, | |
186 | const char * buf, size_t count) | |
187 | { | |
188 | int ret = -EIO; | |
189 | struct cpuidle_device *dev = kobj_to_cpuidledev(kobj); | |
190 | struct cpuidle_attr * cattr = attr_to_cpuidleattr(attr); | |
191 | ||
192 | if (cattr->store) { | |
193 | mutex_lock(&cpuidle_lock); | |
194 | ret = cattr->store(dev, buf, count); | |
195 | mutex_unlock(&cpuidle_lock); | |
196 | } | |
197 | return ret; | |
198 | } | |
199 | ||
52cf25d0 | 200 | static const struct sysfs_ops cpuidle_sysfs_ops = { |
4f86d3a8 LB |
201 | .show = cpuidle_show, |
202 | .store = cpuidle_store, | |
203 | }; | |
204 | ||
205 | static void cpuidle_sysfs_release(struct kobject *kobj) | |
206 | { | |
207 | struct cpuidle_device *dev = kobj_to_cpuidledev(kobj); | |
208 | ||
209 | complete(&dev->kobj_unregister); | |
210 | } | |
211 | ||
212 | static struct kobj_type ktype_cpuidle = { | |
213 | .sysfs_ops = &cpuidle_sysfs_ops, | |
214 | .release = cpuidle_sysfs_release, | |
215 | }; | |
216 | ||
217 | struct cpuidle_state_attr { | |
218 | struct attribute attr; | |
4202735e DD |
219 | ssize_t (*show)(struct cpuidle_state *, \ |
220 | struct cpuidle_state_usage *, char *); | |
dc7fd275 SL |
221 | ssize_t (*store)(struct cpuidle_state *, \ |
222 | struct cpuidle_state_usage *, const char *, size_t); | |
4f86d3a8 LB |
223 | }; |
224 | ||
225 | #define define_one_state_ro(_name, show) \ | |
226 | static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0444, show, NULL) | |
227 | ||
3a53396b SL |
228 | #define define_one_state_rw(_name, show, store) \ |
229 | static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0644, show, store) | |
230 | ||
4f86d3a8 | 231 | #define define_show_state_function(_name) \ |
4202735e DD |
232 | static ssize_t show_state_##_name(struct cpuidle_state *state, \ |
233 | struct cpuidle_state_usage *state_usage, char *buf) \ | |
4f86d3a8 LB |
234 | { \ |
235 | return sprintf(buf, "%u\n", state->_name);\ | |
236 | } | |
237 | ||
dc7fd275 | 238 | #define define_store_state_ull_function(_name) \ |
3a53396b | 239 | static ssize_t store_state_##_name(struct cpuidle_state *state, \ |
dc7fd275 | 240 | struct cpuidle_state_usage *state_usage, \ |
3a53396b SL |
241 | const char *buf, size_t size) \ |
242 | { \ | |
dc7fd275 | 243 | unsigned long long value; \ |
3a53396b SL |
244 | int err; \ |
245 | if (!capable(CAP_SYS_ADMIN)) \ | |
246 | return -EPERM; \ | |
dc7fd275 | 247 | err = kstrtoull(buf, 0, &value); \ |
3a53396b SL |
248 | if (err) \ |
249 | return err; \ | |
250 | if (value) \ | |
dc7fd275 | 251 | state_usage->_name = 1; \ |
3a53396b | 252 | else \ |
dc7fd275 | 253 | state_usage->_name = 0; \ |
3a53396b SL |
254 | return size; \ |
255 | } | |
256 | ||
8b78cf60 | 257 | #define define_show_state_ull_function(_name) \ |
4202735e DD |
258 | static ssize_t show_state_##_name(struct cpuidle_state *state, \ |
259 | struct cpuidle_state_usage *state_usage, char *buf) \ | |
8b78cf60 | 260 | { \ |
4202735e | 261 | return sprintf(buf, "%llu\n", state_usage->_name);\ |
8b78cf60 YY |
262 | } |
263 | ||
4fcb2fcd | 264 | #define define_show_state_str_function(_name) \ |
4202735e DD |
265 | static ssize_t show_state_##_name(struct cpuidle_state *state, \ |
266 | struct cpuidle_state_usage *state_usage, char *buf) \ | |
4fcb2fcd VP |
267 | { \ |
268 | if (state->_name[0] == '\0')\ | |
269 | return sprintf(buf, "<null>\n");\ | |
270 | return sprintf(buf, "%s\n", state->_name);\ | |
4f86d3a8 LB |
271 | } |
272 | ||
273 | define_show_state_function(exit_latency) | |
274 | define_show_state_function(power_usage) | |
8b78cf60 YY |
275 | define_show_state_ull_function(usage) |
276 | define_show_state_ull_function(time) | |
4fcb2fcd VP |
277 | define_show_state_str_function(name) |
278 | define_show_state_str_function(desc) | |
dc7fd275 SL |
279 | define_show_state_ull_function(disable) |
280 | define_store_state_ull_function(disable) | |
4fcb2fcd | 281 | |
4f86d3a8 | 282 | define_one_state_ro(name, show_state_name); |
4fcb2fcd | 283 | define_one_state_ro(desc, show_state_desc); |
4f86d3a8 LB |
284 | define_one_state_ro(latency, show_state_exit_latency); |
285 | define_one_state_ro(power, show_state_power_usage); | |
286 | define_one_state_ro(usage, show_state_usage); | |
287 | define_one_state_ro(time, show_state_time); | |
3a53396b | 288 | define_one_state_rw(disable, show_state_disable, store_state_disable); |
4f86d3a8 LB |
289 | |
290 | static struct attribute *cpuidle_state_default_attrs[] = { | |
291 | &attr_name.attr, | |
4fcb2fcd | 292 | &attr_desc.attr, |
4f86d3a8 LB |
293 | &attr_latency.attr, |
294 | &attr_power.attr, | |
295 | &attr_usage.attr, | |
296 | &attr_time.attr, | |
3a53396b | 297 | &attr_disable.attr, |
4f86d3a8 LB |
298 | NULL |
299 | }; | |
300 | ||
349631e0 DL |
301 | struct cpuidle_state_kobj { |
302 | struct cpuidle_state *state; | |
303 | struct cpuidle_state_usage *state_usage; | |
304 | struct completion kobj_unregister; | |
305 | struct kobject kobj; | |
306 | }; | |
307 | ||
4f86d3a8 LB |
308 | #define kobj_to_state_obj(k) container_of(k, struct cpuidle_state_kobj, kobj) |
309 | #define kobj_to_state(k) (kobj_to_state_obj(k)->state) | |
4202735e | 310 | #define kobj_to_state_usage(k) (kobj_to_state_obj(k)->state_usage) |
4f86d3a8 LB |
311 | #define attr_to_stateattr(a) container_of(a, struct cpuidle_state_attr, attr) |
312 | static ssize_t cpuidle_state_show(struct kobject * kobj, | |
313 | struct attribute * attr ,char * buf) | |
314 | { | |
315 | int ret = -EIO; | |
316 | struct cpuidle_state *state = kobj_to_state(kobj); | |
4202735e | 317 | struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj); |
4f86d3a8 LB |
318 | struct cpuidle_state_attr * cattr = attr_to_stateattr(attr); |
319 | ||
320 | if (cattr->show) | |
4202735e | 321 | ret = cattr->show(state, state_usage, buf); |
4f86d3a8 LB |
322 | |
323 | return ret; | |
324 | } | |
325 | ||
3a53396b SL |
326 | static ssize_t cpuidle_state_store(struct kobject *kobj, |
327 | struct attribute *attr, const char *buf, size_t size) | |
328 | { | |
329 | int ret = -EIO; | |
330 | struct cpuidle_state *state = kobj_to_state(kobj); | |
dc7fd275 | 331 | struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj); |
3a53396b SL |
332 | struct cpuidle_state_attr *cattr = attr_to_stateattr(attr); |
333 | ||
334 | if (cattr->store) | |
dc7fd275 | 335 | ret = cattr->store(state, state_usage, buf, size); |
3a53396b SL |
336 | |
337 | return ret; | |
338 | } | |
339 | ||
52cf25d0 | 340 | static const struct sysfs_ops cpuidle_state_sysfs_ops = { |
4f86d3a8 | 341 | .show = cpuidle_state_show, |
3a53396b | 342 | .store = cpuidle_state_store, |
4f86d3a8 LB |
343 | }; |
344 | ||
345 | static void cpuidle_state_sysfs_release(struct kobject *kobj) | |
346 | { | |
347 | struct cpuidle_state_kobj *state_obj = kobj_to_state_obj(kobj); | |
348 | ||
349 | complete(&state_obj->kobj_unregister); | |
350 | } | |
351 | ||
352 | static struct kobj_type ktype_state_cpuidle = { | |
353 | .sysfs_ops = &cpuidle_state_sysfs_ops, | |
354 | .default_attrs = cpuidle_state_default_attrs, | |
355 | .release = cpuidle_state_sysfs_release, | |
356 | }; | |
357 | ||
42b16b3f | 358 | static inline void cpuidle_free_state_kobj(struct cpuidle_device *device, int i) |
4f86d3a8 | 359 | { |
c10997f6 | 360 | kobject_put(&device->kobjs[i]->kobj); |
4f86d3a8 LB |
361 | wait_for_completion(&device->kobjs[i]->kobj_unregister); |
362 | kfree(device->kobjs[i]); | |
363 | device->kobjs[i] = NULL; | |
364 | } | |
365 | ||
366 | /** | |
bf4d1b5d | 367 | * cpuidle_add_state_sysfs - adds cpuidle states sysfs attributes |
4f86d3a8 LB |
368 | * @device: the target device |
369 | */ | |
bf4d1b5d | 370 | static int cpuidle_add_state_sysfs(struct cpuidle_device *device) |
4f86d3a8 LB |
371 | { |
372 | int i, ret = -ENOMEM; | |
373 | struct cpuidle_state_kobj *kobj; | |
bf4d1b5d | 374 | struct cpuidle_driver *drv = cpuidle_get_cpu_driver(device); |
4f86d3a8 LB |
375 | |
376 | /* state statistics */ | |
392370e7 | 377 | for (i = 0; i < device->state_count; i++) { |
4f86d3a8 LB |
378 | kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL); |
379 | if (!kobj) | |
380 | goto error_state; | |
46bcfad7 | 381 | kobj->state = &drv->states[i]; |
4202735e | 382 | kobj->state_usage = &device->states_usage[i]; |
4f86d3a8 LB |
383 | init_completion(&kobj->kobj_unregister); |
384 | ||
e45a00d6 DL |
385 | ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle, |
386 | &device->kobj, "state%d", i); | |
4f86d3a8 LB |
387 | if (ret) { |
388 | kfree(kobj); | |
389 | goto error_state; | |
390 | } | |
94f57f33 | 391 | kobject_uevent(&kobj->kobj, KOBJ_ADD); |
4f86d3a8 LB |
392 | device->kobjs[i] = kobj; |
393 | } | |
394 | ||
395 | return 0; | |
396 | ||
397 | error_state: | |
398 | for (i = i - 1; i >= 0; i--) | |
399 | cpuidle_free_state_kobj(device, i); | |
400 | return ret; | |
401 | } | |
402 | ||
403 | /** | |
bf4d1b5d | 404 | * cpuidle_remove_driver_sysfs - removes the cpuidle states sysfs attributes |
4f86d3a8 LB |
405 | * @device: the target device |
406 | */ | |
bf4d1b5d | 407 | static void cpuidle_remove_state_sysfs(struct cpuidle_device *device) |
4f86d3a8 LB |
408 | { |
409 | int i; | |
410 | ||
411 | for (i = 0; i < device->state_count; i++) | |
412 | cpuidle_free_state_kobj(device, i); | |
413 | } | |
414 | ||
bf4d1b5d DL |
415 | #ifdef CONFIG_CPU_IDLE_MULTIPLE_DRIVERS |
416 | #define kobj_to_driver_kobj(k) container_of(k, struct cpuidle_driver_kobj, kobj) | |
417 | #define attr_to_driver_attr(a) container_of(a, struct cpuidle_driver_attr, attr) | |
418 | ||
419 | #define define_one_driver_ro(_name, show) \ | |
420 | static struct cpuidle_driver_attr attr_driver_##_name = \ | |
421 | __ATTR(_name, 0644, show, NULL) | |
422 | ||
423 | struct cpuidle_driver_kobj { | |
424 | struct cpuidle_driver *drv; | |
425 | struct completion kobj_unregister; | |
426 | struct kobject kobj; | |
427 | }; | |
428 | ||
429 | struct cpuidle_driver_attr { | |
430 | struct attribute attr; | |
431 | ssize_t (*show)(struct cpuidle_driver *, char *); | |
432 | ssize_t (*store)(struct cpuidle_driver *, const char *, size_t); | |
433 | }; | |
434 | ||
435 | static ssize_t show_driver_name(struct cpuidle_driver *drv, char *buf) | |
436 | { | |
437 | ssize_t ret; | |
438 | ||
439 | spin_lock(&cpuidle_driver_lock); | |
440 | ret = sprintf(buf, "%s\n", drv ? drv->name : "none"); | |
441 | spin_unlock(&cpuidle_driver_lock); | |
442 | ||
443 | return ret; | |
444 | } | |
445 | ||
446 | static void cpuidle_driver_sysfs_release(struct kobject *kobj) | |
447 | { | |
448 | struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj); | |
449 | complete(&driver_kobj->kobj_unregister); | |
450 | } | |
451 | ||
452 | static ssize_t cpuidle_driver_show(struct kobject *kobj, struct attribute * attr, | |
453 | char * buf) | |
454 | { | |
455 | int ret = -EIO; | |
456 | struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj); | |
457 | struct cpuidle_driver_attr *dattr = attr_to_driver_attr(attr); | |
458 | ||
459 | if (dattr->show) | |
460 | ret = dattr->show(driver_kobj->drv, buf); | |
461 | ||
462 | return ret; | |
463 | } | |
464 | ||
465 | static ssize_t cpuidle_driver_store(struct kobject *kobj, struct attribute *attr, | |
466 | const char *buf, size_t size) | |
467 | { | |
468 | int ret = -EIO; | |
469 | struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj); | |
470 | struct cpuidle_driver_attr *dattr = attr_to_driver_attr(attr); | |
471 | ||
472 | if (dattr->store) | |
473 | ret = dattr->store(driver_kobj->drv, buf, size); | |
474 | ||
475 | return ret; | |
476 | } | |
477 | ||
478 | define_one_driver_ro(name, show_driver_name); | |
479 | ||
480 | static const struct sysfs_ops cpuidle_driver_sysfs_ops = { | |
481 | .show = cpuidle_driver_show, | |
482 | .store = cpuidle_driver_store, | |
483 | }; | |
484 | ||
485 | static struct attribute *cpuidle_driver_default_attrs[] = { | |
486 | &attr_driver_name.attr, | |
487 | NULL | |
488 | }; | |
489 | ||
490 | static struct kobj_type ktype_driver_cpuidle = { | |
491 | .sysfs_ops = &cpuidle_driver_sysfs_ops, | |
492 | .default_attrs = cpuidle_driver_default_attrs, | |
493 | .release = cpuidle_driver_sysfs_release, | |
494 | }; | |
495 | ||
496 | /** | |
497 | * cpuidle_add_driver_sysfs - adds the driver name sysfs attribute | |
498 | * @device: the target device | |
499 | */ | |
500 | static int cpuidle_add_driver_sysfs(struct cpuidle_device *dev) | |
501 | { | |
502 | struct cpuidle_driver_kobj *kdrv; | |
503 | struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev); | |
504 | int ret; | |
505 | ||
506 | kdrv = kzalloc(sizeof(*kdrv), GFP_KERNEL); | |
507 | if (!kdrv) | |
508 | return -ENOMEM; | |
509 | ||
510 | kdrv->drv = drv; | |
511 | init_completion(&kdrv->kobj_unregister); | |
512 | ||
513 | ret = kobject_init_and_add(&kdrv->kobj, &ktype_driver_cpuidle, | |
514 | &dev->kobj, "driver"); | |
515 | if (ret) { | |
516 | kfree(kdrv); | |
517 | return ret; | |
518 | } | |
519 | ||
520 | kobject_uevent(&kdrv->kobj, KOBJ_ADD); | |
521 | dev->kobj_driver = kdrv; | |
522 | ||
523 | return ret; | |
524 | } | |
525 | ||
526 | /** | |
527 | * cpuidle_remove_driver_sysfs - removes the driver name sysfs attribute | |
528 | * @device: the target device | |
529 | */ | |
530 | static void cpuidle_remove_driver_sysfs(struct cpuidle_device *dev) | |
531 | { | |
532 | struct cpuidle_driver_kobj *kdrv = dev->kobj_driver; | |
533 | kobject_put(&kdrv->kobj); | |
534 | wait_for_completion(&kdrv->kobj_unregister); | |
535 | kfree(kdrv); | |
536 | } | |
537 | #else | |
538 | static inline int cpuidle_add_driver_sysfs(struct cpuidle_device *dev) | |
539 | { | |
540 | return 0; | |
541 | } | |
542 | ||
543 | static inline void cpuidle_remove_driver_sysfs(struct cpuidle_device *dev) | |
544 | { | |
545 | ; | |
546 | } | |
547 | #endif | |
548 | ||
549 | /** | |
550 | * cpuidle_add_device_sysfs - adds device specific sysfs attributes | |
551 | * @device: the target device | |
552 | */ | |
553 | int cpuidle_add_device_sysfs(struct cpuidle_device *device) | |
554 | { | |
555 | int ret; | |
556 | ||
557 | ret = cpuidle_add_state_sysfs(device); | |
558 | if (ret) | |
559 | return ret; | |
560 | ||
561 | ret = cpuidle_add_driver_sysfs(device); | |
562 | if (ret) | |
563 | cpuidle_remove_state_sysfs(device); | |
564 | return ret; | |
565 | } | |
566 | ||
567 | /** | |
568 | * cpuidle_remove_device_sysfs : removes device specific sysfs attributes | |
569 | * @device : the target device | |
570 | */ | |
571 | void cpuidle_remove_device_sysfs(struct cpuidle_device *device) | |
572 | { | |
573 | cpuidle_remove_driver_sysfs(device); | |
574 | cpuidle_remove_state_sysfs(device); | |
575 | } | |
576 | ||
4f86d3a8 LB |
577 | /** |
578 | * cpuidle_add_sysfs - creates a sysfs instance for the target device | |
8a25a2fd | 579 | * @dev: the target device |
4f86d3a8 | 580 | */ |
1aef40e2 | 581 | int cpuidle_add_sysfs(struct cpuidle_device *dev) |
4f86d3a8 | 582 | { |
1aef40e2 | 583 | struct device *cpu_dev = get_cpu_device((unsigned long)dev->cpu); |
94f57f33 | 584 | int error; |
4f86d3a8 | 585 | |
e45a00d6 DL |
586 | init_completion(&dev->kobj_unregister); |
587 | ||
8a25a2fd | 588 | error = kobject_init_and_add(&dev->kobj, &ktype_cpuidle, &cpu_dev->kobj, |
94f57f33 GKH |
589 | "cpuidle"); |
590 | if (!error) | |
591 | kobject_uevent(&dev->kobj, KOBJ_ADD); | |
592 | return error; | |
4f86d3a8 LB |
593 | } |
594 | ||
595 | /** | |
596 | * cpuidle_remove_sysfs - deletes a sysfs instance on the target device | |
8a25a2fd | 597 | * @dev: the target device |
4f86d3a8 | 598 | */ |
1aef40e2 | 599 | void cpuidle_remove_sysfs(struct cpuidle_device *dev) |
4f86d3a8 | 600 | { |
c10997f6 | 601 | kobject_put(&dev->kobj); |
e45a00d6 | 602 | wait_for_completion(&dev->kobj_unregister); |
4f86d3a8 | 603 | } |